Vulnerability Details CVE-2026-32877
Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.8%
CVSS Severity
CVSS v3 Score 8.2
Products affected by CVE-2026-32877
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cpe:2.3:a:botan_project:botan:2.10.0
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cpe:2.3:a:botan_project:botan:2.11.0
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cpe:2.3:a:botan_project:botan:2.12.0
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cpe:2.3:a:botan_project:botan:2.12.1
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cpe:2.3:a:botan_project:botan:2.13.0
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cpe:2.3:a:botan_project:botan:2.14.0
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cpe:2.3:a:botan_project:botan:2.15.0
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cpe:2.3:a:botan_project:botan:2.16.0
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cpe:2.3:a:botan_project:botan:2.17.0
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cpe:2.3:a:botan_project:botan:2.17.1
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cpe:2.3:a:botan_project:botan:2.17.2
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cpe:2.3:a:botan_project:botan:2.17.3
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cpe:2.3:a:botan_project:botan:2.19.5
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cpe:2.3:a:botan_project:botan:2.3.0
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cpe:2.3:a:botan_project:botan:2.4.0
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cpe:2.3:a:botan_project:botan:2.5.0
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cpe:2.3:a:botan_project:botan:2.6.0
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cpe:2.3:a:botan_project:botan:2.7.0
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cpe:2.3:a:botan_project:botan:2.8.0
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cpe:2.3:a:botan_project:botan:2.9.0
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cpe:2.3:a:botan_project:botan:3.0.0
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cpe:2.3:a:botan_project:botan:3.1.0
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cpe:2.3:a:botan_project:botan:3.1.1
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cpe:2.3:a:botan_project:botan:3.2.0
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cpe:2.3:a:botan_project:botan:3.3.0
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cpe:2.3:a:botan_project:botan:3.3.1
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cpe:2.3:a:botan_project:botan:3.4.0
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cpe:2.3:a:botan_project:botan:3.5.0
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cpe:2.3:a:botan_project:botan:3.6.0
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cpe:2.3:a:botan_project:botan:3.6.1
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cpe:2.3:a:botan_project:botan:3.7.0